Pectis schaffneri Sch. Bip. ex A. Gray

Pectis schaffneri Schultz-Bip.; (A. Gray, Proc. Am. Acad. 19: 45, hyponym. 1S83) Fernald, Proc. Am. Acad. 33: 68. 1897.
A low diffuse annual, about 5 cm. high; stem puberulent; leaves linear, cuspidate, 1-2.5 cm. long, 1-2 mm. wide, distinctly connate at the base, with 5-8 pairs of bristles; glands small in a single submarginal row on each side; heads sessile in the axils; involucre oblong, 6 mm. high, 2 mm. broad; bracts 3 or 4, oblong, acute or acuminate, purple on the margin; glands 1-3, subapical; ray-flowers 3; Ugules oblong, 2 mm. long; disk-flowers 5 or 6; corollas about 2 mm. long; achenes 4 mm. long, strigose; principal squamellae 5 or 6, 3-4 mm. long, with a narrowly linear-lanceolate body and a long scabrous awn-tip, surrounded by a crown of small subulate bristles.
Type loc.lit: Valley of Mexico.
Distribution: Known only from the type locality.